VACUUM CHUCKS
Model KVR VACUUM CHUCKELECTROMAGNETIC CHUCKPERMANENTPERMANENTCHUCKSCONTROLLERS MAGNETIC CHUCKS ELECTROMAGNETIC CHUCKS

Vacuum system required additionally

KVR-2D3060［Application］
Chucks to hold workpieces by utilizing atmospheric pressure.
Nonferrous and nonmagnetic materials can be held and machined.
These chucks are suitable for grinding and cutting plastics andgrinding aluminum, brass, stainless steel, ceramic and glass.
［Features］●The suction holes on the chuck work face can be arranged to set
an effective holding area according to shapes of workpieces bycombined adjustment of thread valves and valves.
●The suction holes have cross grooves to expand the acting
area. Thus, fewer thread valves are used to improve the workeﬃciency.
●The chuck work face is made of iron to allow self-grinding torecover parallelism.
●Since the chuck work face is made of iron, magnetic devices
such as workpiece stoppers can be utilized.
●A special suction hole layout adapter can be installed according
to workpieces and work procedures.
●These chucks can be mounted on magnetic chucks.
●Since no heat source or moving parts are used inside thechucks, highly precise machining is ensured.

BLOCKS
FOR MC■KVR-D (Thread valve type)●An effective holding area can be set according to shapes of
workpieces by combined adjustment of thread valves and valves.
●Since suction grooves of cross shape are provided on the holding
face, the number of thread valves has been reduced to enhance thework eﬃciency.

KVR-H1530

VACUUM
CHUCKSAn example of fabrication of special type

■KVR-H (Small hole type)●Holes of φ4 are provided on the holding face at 8-mm pitches.

PROMELTA*SYSTEM<Precautions for use>

Le

BLOCKS, HOLDERS,MINI CHUCKS

（84）

Be

B1
B2

P

P
25

SINE BARCHUCKSThe vacuum chuck is of such construction that the inside of thechuck is evacuated by a vacuum pump to reduce the internalpressure and a workpiece is held by atmospheric pressure.
Therefore, the holding power is determined by a difference
between the internal pressure and atmospheric pressure and theholding area. Due to physical restrictions, a diﬀerence in pressurethat can be obtained by a pump is about 80 kPa (600 mmHg) in
consideration of the upper limit of available evacuation eﬃciency.
Since the same holding power as about 80 kPa (0.8 kgf/cm2) canbe obtained, if the holding area of a workpiece is 100 cm2, it isheld by a holding power of about 800 N (80 kgf). Note, however,that if the holding face of workpieces is rough or distorted, even if
slightly, atmospheric pressure leak occurs to decrease the holding
power significantly. For such workpieces, some leak preventing
measures must be taken. Workpieces could be deformed by heatgenerated during machining depending on materials and thicknessof workpieces. Pay attention to machining methods. In particular,
thin stainless steel sheets deform due to machining heat largely
and are diﬃcult to hold. If you have questions, please contact us.

HOLDING
TOOLS

h

H

t

L1

MEASURING
TOOL HOLDERSMAGNETICHOLDERSMAGNETIC
TOOLS

43

L2
Model

Nominal Size

［mm
（in）
］
Work Face

₁

Hole Pitch

₁

Mounting Face
₂

Height₂

Mass

KVR-2D1018

100（3.93）×175（6.89） 100（3.93） 175（6.89）

85（3.34）

145（5.70）

96（3.78） 195（7.67）

9kg/ 19 lb

KVR-2D1325

125（4.92）×250（9.84） 125（4.92） 250（9.84）

105（4.13）

225（8.85）

121（4.76） 270（10.6）

15kg/ 33 lb

KVR-2D1515

150（5.90）×150（5.90）

125（4.92）

170（6.69）

11kg/ 24 lb

KVR-2D1530

150（5.90）×300（11.8） 150（5.90） 300（11.8）

KVR-2D1545

150（5.90）×450（17.7）

KVR-2D2035

200（7.87）×350（13.7）

KVR-2D2050

200（7.87）×500（19.6）

KVR-2D3060

300（11.8）×600（23.6） 300（11.8） 600（23.6）

150（5.90）
20450（17.7） （0.78）

200（7.87）

350（13.7）
500（19.6）

125（4.92）

245（9.64）
405（15.9）185（7.28）

P＝20(Staggered layout)（0.78）

305（12.0）
545（21.4）

20

70

VPU-E10
VPU-E20
VPU-D20

22kg/ 48 lb

470（18.5） （0.78） （2.75） 33kg/ 72 lb
370（14.5）

34kg/ 74 lb

520（20.4）

49kg/108 lb

296（11.6） 620（24.4）

88kg/194 lb

96（3.78） 195（7.67）

9kg/19 lb

196（7.71）

465（18.3）285（11.2）（12.6）
146（5.74） 320

Applicable
Vacuum System

VPU-E20
VPU-D20※Clamp parts are included.
KVR-H1018

100（3.93）×175（6.89） 100（3.93） 175（6.89）

72（2.83）

125（4.92）KVR-H1325

125（4.92）×250（9.84） 125（4.92） 250（9.84）

92（3.62）205（8.07）KVR-H1515

150（5.90）×150（5.90）KVR-H1530

150（5.90）×300（11.8）※Clamp parts are included.

150（5.90）

20150（5.90） （0.78）

300（11.8）

125（4.92）

105（4.13）
252（9.92）

P＝8（0.31）

121（4.76） 270（10.6）
146（5.74）

15kg/33 lb
20
70
170（6.69） （0.78） （2.75） 11kg/24 lb

320（12.6）

22kg/48 lb

VPU-E10
VPU-E20
VPU-D20

KVR / KVR-AV / VPU-E-AV［Application］
Nonferrous and nonmagnetic materials can be held and machined.
These chucks are suitable for grinding plastics, aluminum, brass,stainless steel, ceramic and glass by machine tools. They can also be
used for light duty cutting if workpieces can be held ﬁrmly.
［Features］●No masking is required to reduce the setup time:
Place a workpiece, apply grinding ﬂuid and turn the valve. That is all
required. Since the suction holes outside the workpiece areautomatically closed, troublesome masking is not required andgrinding can be started soon.
●Easy valve cleaning:
An original modular design that causes little clogging due to sludge
facilitates maintenance to reduce the running cost.
●Enhanced safety:
An original construction is employed that closes the auto valve
instantly should a workpiece move during grinding. This design causes
no vacuum break and maintains a certain level of holding power.
●Dry operations supported:
In dry grinding operations using no grinding ﬂuid, the chuck can beused with minimum necessary masking only.

P1

Be
(2)

Suction port
shapeBall valve(3 places)

Model

Reverse jet

H

φ7
φ2.5

L2

Work Face

Nominal Size

Vacuum

Evacuate

h

P2

B2

B1

L1

［mm
（in）］

Suction Port Pitch

KVR-AV1018 100（3.93）×175（6.89）100（3.93） 175（6.89）57.5（2.26）132（5.20）
KVR-AV1530 150（5.90）×300（11.8）150（5.90） 300（11.8） 96（5.67）240（9.45）
KVR-AV2040 200（7.87）×400（15.7）200（7.87） 400（15.7） 144（6.89）348（13.7）

12（0.47）

Mounting Face

No.ofSuction Ports

11.5（0.45）

72
188

146（5.75） 320（12.6）

12（0.47）

388

196（7.71） 420（16.5）

908

296（11.6） 620（24.4）KVR-AV3060 300（11.8）×600（23.6）300（11.8） 600（23.6） 228（8.97）540（21.2）※KVR-AV1530, KVR-AV2040 and KVR-AV3060 have places where no suction ports are provided partially.

Height98（3.86） 195（7.68）

Mass

Applicable
Vacuum System

8kg/ 17.6 lb
20（0.79） 70（2.75）

18kg/ 39.7 lb
30kg/ 66.1 lb

VPU-E10-AV

66kg/145.5 lb※Clamp parts are included.

Model VPU-E-AV VACUUM SYSTEM DEDICATED TO AUTO VALVE TYPE VACUUM CHUCKVPU-E10-AV

VPU-E10-AV

Evacuation
VolumeContinuous
Pressure

80 kPa (600 mmHg)
110Nℓ/minor over

SuctionPort
3/8

Compressed Air
PressureConsumption

Coupler
20PM (Nitto Kohki)

500̶600kPa（5̶6kgf/cm2）

180Nℓ/minReverse jet connection

Dimensions
Supply port Out Dia.
1/4

Tank
Mass
Height Capacity

φ277
425
（10.9） （16.7）

15ℓ

φ277
０．
０６
０．
０４
０．
０８ ０．
０２
０．
１ａ ０
ＭＰ

25kg/
55 lb

※The capacity of a compressor to use must be 2.5 kW or over. φ12 hose, 10 m long, is included as an accessory.

Vacuumconnection

MAGNETIC
TOOLS(Provide compressor.)

Vacuum system

425

Piping of vacuum system
Compressed air

MEASURING
TOOL HOLDERS

Ball
valve

［mm
（in）
］
Model

HOLDINGTOOLS［Application］
A vacuum system dedicated to the auto valve type vacuum chucks. The
shuck side is evacuated continuously in order to eﬀectively maintain theatmospheric pressure on the workpiece on the chuck work face.
［Features］●A vacuum evacuation system, ﬁlter, vacuum tank and vacuum gage areincorporated neatly.
●Since connectors are provided, the pipes of vacuum and reverse jet
required for control of the vacuum chuck can be connected easily.
●A difference in pressure over 80 kPa (600 mmHg) can be obtained
continuously.

Dry/wetoperations

VACUUM
CHUCKS(Technical tie-up with
Taiyo Tec Company)

Suction port

PROMELTA*SYSTEM

Le

SINE BARCHUCKS

Patented
Stopper

BLOCKS, HOLDERS,MINI CHUCKS

KVR-AV1530

MAGNETICHOLDERS

Vacuum system
required additionally

BLOCKS
FOR MCAn epoch-making vacuum chuck that requires no masking!

PERMANENTPERMANENTCHUCKELECTROMAGNETIC
ELECTROMAGNETIC CHUCKS MAGNETIC CHUCKS CONTROLLERS CHUCKS

Model KVR-AV AUTO VALVE TYPE VACUUM CHUCK

Vacuum chuck

Evacuation
VacuumReverse jet
Drain valve

44

VACUUM CHUCKS
Model KVR-GVW VACUUM CHUCK WITH BUILT-IN VACUUM SYSTEMELECTROMAGNETIC CHUCKPERMANENTPERMANENTCHUCKSCONTROLLERS MAGNETIC CHUCKS ELECTROMAGNETIC CHUCKS

No external vacuum system required! ［Application］
Suitable for light duty cutting by vacuum chucking such nonmagnetic
as aluminum alloy, copper alloy, stainless steel andAir consumption reduced signiﬁcantly! workpieces
plastics.

KVR-GVW1530
Single stopper

Suction port（1 Place）(2 faces)

［mm
（in）
］

Main Unit
Material

Model

BLOCKS
FOR MCAir joint(20PF)Air tube(φ8),5m

VACUUM
CHUCKS

Vacuumgage
Silencer

Mild
steel

Ball valve

₁

₂

₁

Grid Pitch Eﬀective Area

KVR-GVW2050

×

₂

×

20
（0.78）
×20（0.78）

200（7.87）
× 500
524
200
500
（19.7） （19.7）（20.6）（7.87）

300（11.8）
× 600
624
300
25
（0.98）
×600（23.6）（23.6）（24.5）（11.8） 65
25（0.98）
1590
150（5.90）× 300
300
150 （2.55）（0.59）（3.54）
KVR-GVAW1530
300（11.8） （11.8）（11.8）（5.90）
20（0.78）
×20（0.78）
Aluminum 200（7.87）
× 500
524
200
KVR-GVAW2050
alloy
500
（19.7） （19.7）（20.6）（7.87）

KVR-GVW3060

300（11.8）
× 600
624
300
600
（23.6）（23.6）（24.5）（11.8）

KVR-GVAW3060

Cover

Dimensions

NominalSize

150（5.90）
× 300
300
150
300
（11.8） （11.8）（11.8）（5.90）

KVR-GVW1530

25（0.98）
×25（0.98）

Mass

120（4.72）
×280（11.0）

17kg/
37 lb

180
（7.08）
×480（18.8）

43kg/
94 lb

275
（10.8）
×575（22.6）

82kg/
180 lb120（4.72）
×280（11.0）

6kg/
13 lb

180
（7.08）
×480（18.8）

15kg/
33 lb

275
（10.8）
×575（22.6）

29kg/
63 lb

※Seal rubber φ4, 10 m, air tube 5 m and clamp parts are included. ※The capacity of a compressor to use must be 0.75
kW or over.

PROMELTA*SYSTEM

Model KVR-G VACUUM CHUCK (GRID SEAL TYPE)

SINE BARCHUCKSBLOCKS, HOLDERS,MINI CHUCKSKVR-G1530

Vacuum system required additionally
Single stopper (2 faces)［Application］
Suitable for grinding by vacuum chucking such nonmagnetic workpieces as aluminum alloy,
copper alloy, stainless steel and plastics.
［Features］●Workpieces are vacuum chucked in the area deﬁned by seal rubber strings set in thegrid grooves, ensuring good sealing and consistent holding power.
●A desired work area can be set by cutting the seal rubber string (φ6 × 5 ‒ 20 m
included) according to workpieces.
●The suction ports are provided in two places on all models to allow setting two
workpieces.
●A vacuum coupler to connect to the vacuum system is provided. (Vacuum is turned on
and oﬀ with the valve on the vacuum system.)●Single stoppers are provided.
●The main unit is made of iron to enable the chuck to be held by an existing magnetic chuck.
See Model KETV:ELECTROMAGNETIC CHUCK WITH VACUUM CHUCK on page 11.

Suction port (2 places)

B2

［mm
（in）
］
Model

L3

Vacuumcoupler (3/8 )Le

MAGNETICHOLDERS

L2

₁

₂

₁

₂

KVR-G2050

200（7.87）× 500 524 200
500（19.7）（19.7）（20.6）（7.87）KVR-G306060
15300（11.8）× 600 624 300（2.36）（0.59）
600（23.6）（23.6）（24.5）（11.8）KVR-G4080

400（15.7）× 800 824 400
800（31.5）（31.5）（32.4）（15.7）KVR-G50100

500（19.7）× 1000 1024 500
1000（39.4）（39.4）（40.3）（19.7）

H

12

Grid Pitch Eﬀective Area

Dimensions

KVR-G1530

P

L4

NominalSize

150（5.90）× 300 324 150
300（11.8）（11.8）（12.7）（5.90）L1h

MEASURING
TOOL HOLDERS

（30）

P

Be

B1

HOLDINGTOOLSMAGNETIC
TOOLS

45［Features］●Compared with the conventional ejector vacuum system, the air
consumption amount can be reduced signiﬁcantly.
●The chuck can be used by simply connecting a quick-connector
type tube to a compressor in the factory.
●Since no vacuum system is required, the chuck has good response
and is capable of holding and releasing workpieces quickly.
● Since air can be injected reversely through the suction port, theinside can be cleaned to facilitate maintenance.
● The internal parts can be replaced easily by removing the front
cover of the chuck.
●The material of the main unit can be selected from two kinds; mild
steel and aluminum alloy.
●Can be used in wet operations.

₃

₄

×

×

55
120
120（4.72）×（2.16） 50 （4.72） 20×20
280（11.0）
50 （1.96） 220 （0.78×0.78） 180（7.08）×（1.96）（8.66）
480（18.9）
275（10.8）

275（10.8）×575（22.6）

Mass

Applicable
Vacuum System

22kg/ 48 lb
46kg/101 lb
82kg/180 lb

63
63
25×25
350
375（14.7）×146kg/321 lb（2.48）（2.48）（0.98×0.98） 775（30.5）（13.7）
475（18.7）VPU-E10
VPU-D20
VPU-EG

475（18.7）×228kg/503 lb
975（38.3）

An example of special specification

KVR-G100140

An example of special specification

KVR-GR
An example of KVR-GR
special speciﬁcation

KVR-GVW / KVR-G / VPU / VPU-EG / VPU-OV

A vacuum system to reduce pressure by evacuation by a pump driven by a motor. A powersource only is required to obtain an independent vacuum source. Note, however, this is
recommended only for dry machining operations.

■Examples of application of vacuum
chucks and vacuum systems
Chuck

Pump

VPU-E10
VPU-E20
VPU-D20

1018

1325

1515

1530

1545

2035

2050

3060

◯

◯

◯

◯

−

−

−

−

◯

◯

◯

◯

◯

◯

◯

◯

■Other types

If the physical contact with the bottom face of workpieces is poor, a large amount of air leaks,
requiring a large evacuation amount. In such a case, a blower type is required for dry
operations and a water-sealed vacuum pump is required for wet operations depending on work
conditions. Please contact us.

Piping of vacuum system
Compressed air

Vacuum system(VPU-E)

Vacuum system(VPU-D)

Vacuum chuck

Operating valve

Vacuum chuck

Operating valve(Provide compressor.)■Ejector type VPU-E
Model

Evacuation
VolumeVPU-E10110Nℓ/min

VPU-E20220Nℓ/min

［mm
（in）
］

Continuous Pressure Suction
Diﬀerence
Port
80 kPa (600 mmHG)
or over.

Pressure

Compressed Air
Consumption

Supply port

180Nℓ/min

1/4

φ280（11.0）

360Nℓ/min

3/8

φ330（12.9）

500‒600kPa（5‒6kgf/cm2）

3/8

Dimensions
Out. dia.
HeightTank CapacityMass425（16.7）15ℓ

25kg/55 lb

600（23.6）30ℓ

45kg/99 lb※The capacity of a compressor to use must be 2.5 kW or over for VPU-E10 and 4.5 kW or over for VPU-E20. ※(1) Operating valve and (2) φ12 hose 10 m and coupler for vacuum included.

■Dry pump type VPU-D (for dry operations)
Model

Continuous PressureDiﬀerence

Evacuation Volume

VPU-D20220/260Nℓ/min（50/60Hz） 80 kPa (600 mmHG) or over

［mm
（in）
］

SuctionPort

Power Source

3/8

3-phase 200 VAC, 0.4 kW

Width

Dimensions
LengthHeight320（12.6）700（27.5）710（27.9）

Tank Capacity

Mass

35ℓ

68kg/149 lb※(1) Operating valve, (2) φ12 hose 10 m and coupler for vacuum included. (3) power cable 5 m are included as accessories.

Model VPU-EG VACUUM SYSTEM

Light weight and compact. Satisfactory functions!

Dry operation(Wet operation not allowed)

VPU-EG［Application］
A vacuum system dedicated to the grid seal type vacuum chucks.
［Features］●The vacuum tank has been eliminated to make a very compact size compared with the conventional model(VPU-E10). This system can be handled easily.
●A function to check the vacuum status is incorporated.
●This is for dry operation.
●Auxiliary functions in consideration of operating status and safety are incorporated. (Vacuum adjustment,interlock with the machine via vacuum check output signals, etc.)

［mm
（in）
］

Model

Evacuation
VolumeContinuous PressureDiﬀerence

Suction Port

VPU-EG

27Nℓ/min

80 kPa (600 mmHG)
or over.

φ8 tube joint (Hose andvacuum coupler included)

Pressure

Compressed Air
Consumption

500ー600kPa（5ー6kgf/cm2）

44Nℓ/minSupply port

Out. dia.

Dimensions
Length

Vacuum coupler
20PM (Nitto Kohki)

200（7.87）

250（9.84）

Height190（7.48）

Mass
6kg/13.2 lb※The capacity of a compressor to use must be around 0.75 kW. ※φ8 hose 5m and coupler for vacuum included.

Model VPU-OV OPERATION BLOCK WITH VACUUM GAGE
Hose nipple (3/8”)(Connected tovacuum system)

Hose nipple (3/8”)(Connected to vacuum chuck)

(10)

70

φ64

70
(10)

90

(10)

VPU-OV(10)90
4-6.6 drill, φ11 counterbore 8 deep

(55)

40

［Application］
An option to facilitate the use of vacuum chucks.
［Features］●The operating valve and the vacuum gage have been
integrated to enable it to check the state of workpieceholding near the chuck.
●By changing the location of the blank cap, a position tomount the vacuum gage can be selected from three places.

BLOCKS
FOR MC■Dry pump type VPU-D<Operating valve>

VACUUM
CHUCKSVPU-D20
VPU-E10

PROMELTA*SYSTEM

A vacuum system to reduce pressure by jetting air at high pressure (principle of the spray gun).
This is recommended where an air line by use of a compressor is installed. This type can beused for both wet and dry machining operations. However, the use of a lubricator in the air line
must be avoided.

SINE BARCHUCKS■Ejector type VPU-E

BLOCKS, HOLDERS,MINI CHUCKS●A vacuum evacuation system, ﬁlter, vacuum tank and vacuum gage are incorporated neatly.
●Suction and evacuation operations to mount and demount workpieces can be done quickly
and easily with the attached special operating handle.
●A diﬀerence in pressure over 80 kPa (600 mmHg) can be obtained continuously.

HOLDING
TOOLS［Features］

MEASURING
TOOL HOLDERS

A vacuum system dedicated to the vacuum chucks. The shuck side is evacuated continuously
in order to eﬀectively maintain atmospheric pressure on the workpiece on the chuck work face.
Note that this system must not be modiﬁed to a pressure container.

MAGNETICHOLDERS［Application］

Dry operation(Wet operation not allowed)

MAGNETIC
TOOLS

Dry/wetoperations

PERMANENTPERMANENTCHUCKELECTROMAGNETIC
ELECTROMAGNETIC CHUCKS MAGNETIC CHUCKS CONTROLLERS CHUCKS

Model VPU VACUUM SYSTEM

46